Black screen and flashing caps lock and unlock

[Boss_Kuda]

Hello, I've been having problems with my HP Probook 450 G7. The laptop is not starting up and the moment I switch it up the on button remains lit same as the f8 and f11 buttons. Then a few seconds later the Caps lock and unlock button start to flash 5 times and then the fan starts running but making a loud noise. Please help me with what could be wrong with my PC. 

[ProGamer220107]

Try this writtef by another person to another post:

Turn off the computer.

o Disconnect the computer from any port replicators or docking stations.

o Disconnect all peripheral devices, such as USB storage devices, external displays, or printers.

o Disconnect the AC adapter from the computer.

o Turn the computer over and look for the battery compartment door to determine whether or not your computer's battery is removable.

o Now to consume any residual electrical charge from the capacitors protecting the memory, perform the following as it is the basics of this:

If you see an access door to the battery compartment, your equipment has a removable battery. Remove the battery, press and hold the power button for 15 seconds, reinsert the battery back into the compartment and proceed to the next step.

If you do not see any access door to the battery compartment, your computer does not have a removable battery. On most laptops with a non-removable battery, press and hold the power button for 15 seconds to complete the restart and proceed to the next step. More information: https://support.hp.com/mx-es/document/c01811996

1. Reconnect the AC adapter to the computer, but do not connect any peripheral devices.

2. Turn on the computer.

If a startup menu opens, use the arrow keys to select Start Windows normally and then press enter.

3. Once the peripheral devices are connected, run Windows Update and HP Support Assistant to update all drivers and the system.